Q:

# Write a program in C to check whether a given number is a Kaprekar number or not

Write a program in C to check whether a given number is a Kaprekar number or not

`Expected Output :Input a number: 4545 is a Kaprekar number.`

``````# include <stdio.h>
# include <stdbool.h>
# include <math.h>

bool chkkaprekar(int n)
{
if (n == 1)
return true;
int sqr_n = n * n;
int ctr_digits = 0;
while (sqr_n)
{
ctr_digits++;
sqr_n /= 10;
}
sqr_n = n*n;
for (int r_digits=1; r_digits<ctr_digits; r_digits++)
{
int eq_parts = pow(10, r_digits);

if (eq_parts == n)
continue;
int sum = sqr_n/eq_parts + sqr_n % eq_parts;
if (sum == n)
return true;
}
return false;
}
int main()
{
int kpno;
printf("\n\n Check whether a given number is a Kaprekar number: \n");
printf(" -------------------------------------------------------\n");
printf(" Input a number: ");
scanf("%d",&kpno);
if (chkkaprekar(kpno)==true)
{
printf("%d is a Kaprekar number. \n",kpno);
}
else
{
printf("%d is not a Kaprekar number. \n",kpno);
}
}``````